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Ladder Jack Set

A ladder jack set is a pair of brackets that clamp onto two extension ladders to carry a scaffold plank between them, creating an elevated work platform along a wall or roofline without erecting scaffolding. The catalog lists 5 models from Metaltech and Bosch.

Modelos

5–8 ft class band

Supported platform height range

Marcas

Cómo funciona

Each jack hooks over two or three rungs and hangs a plank shelf either inside (under) or outside (over) the ladder face. With two ladders set at matching angle and spacing, a plank spans the jacks to form a walkable platform. The system borrows its stability from correct ladder setup — both ladders at the proper lean on firm ground — and its capacity from the weakest link among ladders, jacks and plank, which is why all three are checked as a system.

Tipos y variantes

Two-rung ladder jacks: Compact jacks bearing on two rungs, for lighter-duty platforms.
Three-rung ladder jacks: Longer jacks spreading load across three rungs for a steadier bearing.
Inside/outside adjustable jacks: Reversible designs that hang the plank under or outside the ladder face as clearance demands.

Especificaciones clave

Especificación	Rango típico	Qué significa
Supported platform height range	5–8 ft class band	The band this class serves; OSHA caps ladder-jack scaffold platforms at 20 ft regardless of components.
Rung engagement	Two- or three-rung, varies by model	More rungs spread the load and reduce rung stress on the host ladder.
Model variety	5 models	A small accessory class paired with ladders and planks sold separately.

Cómo la industria lo dimensiona

Ladder jacks themselves come in one size class; the working height is set by the host ladders and the plank span, and this catalog band covers 5–8 ft platforms. OSHA limits ladder-jack scaffold platforms to 20 ft, and both host ladders must be heavy-duty types rated for the combined platform load, so the system is sized from the plank rating and ladder duty rating together.

Aplicaciones

Siding installation along a wall line
Fascia, soffit and trim replacement
Exterior painting at eave height
Gutter installation and repair

Seguridad y operación

OSHA 29 CFR 1926.452(k) governs ladder-jack scaffolds: platforms are capped at 20 ft, and host ladders must be heavy-duty types in proper setup.
Fall protection applies per scaffold rules — above the threshold height, a personal fall arrest system is the practical control on a ladder-jack platform.
Both ladders stand on firm, level ground at the correct angle; a settling foot on one side racks the whole platform.
Plank grade and span rating are verified — the plank, not the jacks, is usually the limiting component.

Normas y certificaciones

OSHA · 29 CFR 1926.452(k): Specific requirements for ladder-jack scaffolds, including the 20 ft platform height cap.
ANSI ASC · A14: Ladder duty-rating standards governing the host extension ladders.

Preguntas frecuentes

How high can a ladder-jack platform legally go?

OSHA caps ladder-jack scaffold platforms at 20 ft; this class serves the 5-8 ft band where the system is most practical.

What ladders work with ladder jacks?

Heavy-duty extension ladders rated for the combined load, set at the proper angle on firm ground — the jacks are only as good as the ladders under them.

When is scaffolding better than ladder jacks?

For longer duration work, heavier material loads or heights approaching the 20 ft cap, a frame scaffold or baker tower is the safer and more productive platform.